diff --git a/modules/video_filter/opencv_example.cpp b/modules/video_filter/opencv_example.cpp
index ae3af05..998f286 100644
--- a/modules/video_filter/opencv_example.cpp
+++ b/modules/video_filter/opencv_example.cpp
@@ -41,6 +41,8 @@
 
 #include <opencv2/core/core_c.h>
 #include <opencv2/core/core.hpp>
+#include <opencv2/imgproc/imgproc_c.h>
+#include <opencv2/imgproc/imgproc.hpp>
 #include <opencv2/objdetect/objdetect.hpp>
 
 /*****************************************************************************
